You can visit this attraction with "Prague Castle ticket - short tour unguided" (optional to any WelcomeCard at only € 9,-).
The staircase in house No. 12 affords access to the terrace in front of the tower called Daliborka. This round cannon tower formed a part of the Jagiello fortification system and its bottom floor was used as a prison from the beginning. The first and also the best-known prisoner was the knight Dalibor of Kozojedy, who was imprisoned here in 1498. Another well-known prisoner was Baron Frantisek Antonin Spork of East Bohemia, renowned in the 18th century as an admirer and patron of art.